<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon :closable="false"></el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 商品分类的级联选择框 -->
                    <el-cascader
                            v-model="selectedCateKeys"
                            :options="cateList"
                            :props="cateProps"
                            @change="handleChange"
                    ></el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区域 -->
            <el-tabs v-model="activeTabsName" @tab-click="handleTabsClick">
                <!-- 添加动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button
                            type="primary"
                            size="mini"
                            :disabled="isBtnDisabled"
                            @click="addDialogVisible = true"
                    >添加参数
                    </el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开列 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag
                                        v-for="(item, i) in scope.row.attr_vals"
                                        :key="i"
                                        closable
                                        @close="handleClose(i, scope.row)"
                                >{{item}}
                                </el-tag>
                                <!-- 输入Tag文本框 -->
                                <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                ></el-input>
                                <el-button
                                        v-else
                                        class="button-new-tag"
                                        size="small"
                                        @click="showInput(scope.row)"
                                >+ New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column>
                            <template slot-scope="scope">
                                <el-button
                                        type="primary"
                                        icon="el-icon-edit"
                                        size="mini"
                                        @click="showEditDialog(scope.row.attr_id)"
                                >编辑
                                </el-button>
                                <el-button
                                        type="danger"
                                        icon="el-icon-delete"
                                        size="mini"
                                        @click="removeParams(scope.row.attr_id)"
                                >删除
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button
                            type="primary"
                            size="mini"
                            :disabled="isBtnDisabled"
                            @click="addDialogVisible = true"
                    >添加属性
                    </el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开列 -->
                        <!-- 展开列 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag
                                        v-for="(item, i) in scope.row.attr_vals"
                                        :key="i"
                                        closable
                                        @close="handleClose(i, scope.row)"
                                >{{item}}
                                </el-tag>
                                <!-- 输入Tag文本框 -->
                                <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                ></el-input>
                                <el-button
                                        v-else
                                        class="button-new-tag"
                                        size="small"
                                        @click="showInput(scope.row)"
                                >+ New Tag
                                </el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column>
                            <template slot-scope="scope">
                                <el-button
                                        type="primary"
                                        icon="el-icon-edit"
                                        size="mini"
                                        @click="showEditDialog(scope.row.attr_id)"
                                >编辑
                                </el-button>
                                <el-button
                                        type="danger"
                                        icon="el-icon-delete"
                                        size="mini"
                                        @click="removeParams(scope.row.attr_id)"
                                >删除
                                </el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数对话框 -->
        <el-dialog
                :title=" '添加' + getTitleText"
                :visible.sync="addDialogVisible"
                width="50%"
                @close="addDialogClosed"
        >
            <el-form :model="addFrom" :rules="addFromRules" ref="addFromRef" label-width="100px">
                <el-form-item :label="getTitleText" prop="attr_name">
                    <el-input v-model="addFrom.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
        </el-dialog>

        <!-- 编辑参数对话框 -->
        <el-dialog
                :title=" '修改' + getTitleText"
                :visible.sync="editDialogVisible"
                width="50%"
                @close="editDialogClosed"
        >
            <el-form :model="editFrom" :rules="editFromRules" ref="editFromRef" label-width="100px">
                <el-form-item :label="getTitleText" prop="attr_name">
                    <el-input v-model="editFrom.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
        </el-dialog>
    </div>
</template>

<script>
    export default {
        name: 'Params',
        data() {
            return {
                // 商品分类列表
                cateList: [],
                //   级联选择框的配置对象
                cateProps: {
                    expandTrigger: 'hover',
                    value: 'cat_id',
                    label: 'cat_name',
                    children: 'children'
                },
                //   级联选择框双向绑定对象
                selectedCateKeys: [],
                //   激活页签名称
                activeTabsName: 'many',
                //   动态参数数据
                manyTableData: [],
                //   静态属性数据
                onlyTableData: [],
                //   控制添加参数对话框的显示与隐藏
                addDialogVisible: false,
                //   添加表单的数据对象
                addFrom: {
                    attr_name: ''
                },
                //   添加表单的验证规则
                addFromRules: {
                    attr_name: [
                        {required: true, message: '请输入参数名称', trigger: 'blur'}
                    ]
                },
                //   编辑对话框
                editDialogVisible: false,
                //   修改表单数据对象
                editFrom: {},
                //   修改表单验证规则
                editFromRules: {
                    attr_name: [
                        {required: true, message: '请输入参数名称', trigger: 'blur'}
                    ]
                }
            }
        },
        created() {
            this.getCateList()
        },
        computed: {
            //   按钮需要被禁用返回true, 否则返回false
            isBtnDisabled() {
                if (this.selectedCateKeys.length !== 3) {
                    return true
                }
                return false
            },
            // 当前选中的三级分类Id
            getCateId() {
                if (this.selectedCateKeys.length === 3) {
                    return this.selectedCateKeys[2]
                }
                return null
            },
            getTitleText() {
                if (this.activeTabsName === 'many') {
                    return '动态参数'
                }
                return '静态属性'
            }
        },
        methods: {
            //   获取所有的商品分类列表
            async getCateList() {
                const {data: res} = await this.$http.get('categories')
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品数据列表失败！')
                }
                this.cateList = res.data
            },
            // 级联选择框 选中变化 触发
            handleChange() {
                this.getParamsData()
            },
            // Tab页签点击事件的处理函数
            handleTabsClick() {
                this.getParamsData()
            },
            // 获取参数的列表数据
            async getParamsData() {
                // 只允许选择三级分类：
                // 通过数组的长度判断
                if (this.selectedCateKeys.length !== 3) {
                    this.selectedCateKeys = []
                    // 清空表格数据
                    this.manyTableData = []
                    this.onlyTableData = []
                    return
                }
                //   根据所选分类的Id,和当前面板的参数, 获取对应的参数
                const {data: res} = await this.$http.get(
                    `categories/${this.getCateId}/attributes`,
                    {
                        params: {sel: this.activeTabsName}
                    }
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('获取参数列表失败！')
                }

                res.data.forEach(item => {
                    //   通过三元表达式判断attr_vals是否为空
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []

                    // 控制文本框的显示与隐藏
                    item.inputVisible = false
                    // 文本框的输入值
                    item.inputValue = ''
                })
                if (this.activeTabsName === 'many') {
                    this.manyTableData = res.data
                } else {
                    this.onlyTableData = res.data
                }
            },
            // 监听对话框的关闭事件
            addDialogClosed() {
                this.$refs.addFromRef.resetFields()
            },
            // 添加参数
            addParams() {
                this.$refs.addFromRef.validate(async valid => {
                    if (!valid) return
                    const {data: res} = await this.$http.post(
                        `categories/${this.getCateId}/attributes`,
                        {
                            attr_name: this.addFrom.attr_name,
                            attr_sel: this.activeTabsName
                        }
                    )
                    if (res.meta.status !== 201) {
                        return this.$message.error('添加参数失败！')
                    }
                    this.$message.success('添加参数成功！')
                    this.addDialogVisible = false
                    this.getParamsData()
                })
            },
            // 显示编辑对话框
            async showEditDialog(attrId) {
                const {data: res} = await this.$http.get(
                    `categories/${this.getCateId}/attributes/${attrId}`,
                    {
                        params: {attr_sel: this.activeTabsName}
                    }
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('获取分类失败！')
                }
                this.editFrom = res.data
                this.editDialogVisible = true
            },
            // 重置修改表单
            editDialogClosed() {
                this.$refs.editFromRef.resetFields()
            },
            // 修改参数
            editParams() {
                this.$refs.editFromRef.validate(async valid => {
                    if (!valid) return
                    const {data: res} = await this.$http.put(
                        `categories/${this.getCateId}/attributes/${this.editFrom.attr_id}`,
                        {
                            attr_name: this.editFrom.attr_name,
                            attr_sel: this.activeTabsName
                        }
                    )
                    if (res.meta.status !== 200) {
                        return this.$message.error('修改参数失败！')
                    }
                    this.$message.success('修改参数成功！')
                    this.getParamsData()
                    this.editDialogVisible = false
                })
            },
            // 根据Id删除对应的参数项
            async removeParams(attrId) {
                const confirmResult = await this.$confirm(
                    '此操作将永久删除该参数, 是否继续?',
                    '提示',
                    {
                        confirmButtonText: '确定',
                        cancelButtonText: '取消',
                        type: 'warning'
                    }
                ).catch(err => err)
                if (confirmResult !== 'confirm') {
                    return this.$message.info('已取消删除！')
                }
                const {data: res} = await this.$http.delete(
                    `categories/${this.getCateId}/attributes/${attrId}`
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('删除参数失败！')
                }
                this.$message.success('删除参数成功！')
                this.getParamsData()
            },
            // 文本框失去焦点,或者按下Enter触发
            handleInputConfirm(row) {
                // 输入的内容为空时，清空
                if (row.inputValue.trim().length === 0) {
                    row.inputValue = ''
                    row.inputVisible = false
                    return
                }
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue = ''
                row.inputVisible = false
                // 提交数据库，保存修改
                this.saveAttrVals(row)
            },
            // 将对attr_vals（Tag） 的操作 保存到数据库
            async saveAttrVals(row) {
                const {data: res} = await this.$http.put(
                    `categories/${this.getCateId}/attributes/${row.attr_id}`,
                    {
                        attr_name: row.attr_name,
                        attr_sel: row.attr_sel,
                        attr_vals: row.attr_vals.join(' ')
                    }
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数项失败！')
                }
                this.$message.success('修改参数项成功！')
            },
            // 点击按钮显示输入框
            showInput(row) {
                row.inputVisible = true
                //   让输入框自动获取焦点
                // $nextTick方法的作用：当页面元素被重新渲染之后，才会至指定回调函数中的代码
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus()
                })
            },
            // 删除对应的参数可选项
            handleClose(i, row) {
                row.attr_vals.splice(i, 1)
                this.saveAttrVals(row)
            }
        }
    }
</script>

<style lang="less" scoped>
    .cat_opt {
        margin: 15px 0px;
    }

    .el-cascader {
        width: 25%;
    }

    .el-tag {
        margin: 8px;
    }

    .input-new-tag {
        width: 90px;
    }

    .button-new-tag {
        height: 32px;
        line-height: 30px;
        padding-top: 0;
        padding-bottom: 0;
    }

    .el-card {
        margin-top: 10px;
    }
</style>
